[OpenID] The delegation story in OpenID 2.0

Johnny Bufu johnny at sxip.com
Thu Jan 18 23:40:30 UTC 2007

On 18-Jan-07, at 3:18 PM, Dmitry Shechtman wrote:

>> [...] HTML allows multiple link relationships to be specified for a
>> single link, so if an OP provides both OpenID Authentication 1.1
>> and OpenID Authentication 2.0, "openid2.provider" and
>> "openid.server" may appear in the same "rel" attribute.
> I was so naïve to have thought OpenID 2.0 was backward-compatible.
> If it's not broken, don't fix it!

OpenID2 is intended to be backwards-compatible with 1.1.

However, if a RP wishes to use some extra functionality that was  
added in 2.0, it would be useful for it to determine the capability  
of it's peer during discovery. This is the reason for the different  
tags  for v1/v2 HTML discovery.


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